bug 1717119 apparently fixed 1080p h264, but not 4k VP8.

My Macbook (Intel Iris Graphics 6100 (BDW GT3)) doesn't support VP9, therefore I am testing VP8.

Last good build used 21-24% GPU video decoding (sudo intel_gpu_top).

With media.ffvpx.enabled:true, the video freezes, GPU video decoding is at 100% (sudo intel_gpu_top). My Wayland desktop locked up.

With media.ffvpx.enabled:false, I immediately get "Video can't be played because the file is corrupt."

Same regression range as the other bugs (bug 1716638, bug 1716689):
mozregression --good 2021-06-14 --bad 20210625093436 --pref gfx.x11-egl.force-enabled:true media.ffmpeg.vaapi.enabled:true media.ffvpx.enabled:false media.rdd-ffvpx.enabled:false media.rdd-vpx.enabled:false -a 'https://upload.wikimedia.org/wikipedia/commons/1/18/The_Earth_in_4k.webm'

7:39.86 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=5e5c1c7e7db0d6e996ccbf56a9aa8e445bc099eb&tochange=97fb4c742d684da863aa27a32ae9d1daa8d67928

97fb4c742d684da863aa27a32ae9d1daa8d67928 alwu — Bug 1692881 - part2 : keep decoded video has at least same amount of duration as decoded audio data. r=bryce
db7fd455cc6af66a965d3ee6f4b3c3a2d00f1a37 alwu — Bug 1692881 - part1 : let MDSM detect whether the video decoding is too slow and force to request the next key frame. r=bryce

Could you help me to capture the log with MOZ_LOG=PlatformDecoderModule:5?
Thank you.

If it's not allowed to store too many frames while using VAAPI, then I will prefer to restrict the mechanism of agressively storing frames further and make it only happen on SW decoding.

MOZ_LOG=PlatformDecoderModule:5 mozregression --launch 20210625093436 --pref gfx.x11-egl.force-enabled:true media.ffmpeg.vaapi.enabled:true media.ffvpx.enabled:false media.rdd-ffvpx.enabled:false media.rdd-vpx.enabled:false -a 'https://upload.wikimedia.org/wikipedia/commons/1/18/The_Earth_in_4k.webm' -P stdout > 4kvp8.txt

So same get_buffer() failed which indicates that ffmpeg also has similar threshold for stroring vpx frames. Could you also help me confirm if 4K vp8 can be played correctly after turning off VAAPI?
Thank you.

Yes, the problem does not occur if VAAPI is disabled.

MOZ_LOG=PlatformDecoderModule:5 mozregression --launch 20210625093436 --pref gfx.x11-egl.force-enabled:true media.ffmpeg.vaapi.enabled:false media.ffvpx.enabled:false media.rdd-ffvpx.enabled:false media.rdd-vpx.enabled:false -a 'https://upload.wikimedia.org/wikipedia/commons/1/18/The_Earth_in_4k.webm' -P stdout > 4kvp8_vaapi_disabled_is_fine.txt

https://hg.mozilla.org/mozilla-central/rev/d23b5390345d